US5457350A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Laminated core of rotating electric machine
Assignee: Nidec Instruments Corp
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Filing: 1993-07-28
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Granted: 1995-10-10
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Expires: 2013-07-28
Abstract
Abstract A laminated core for a rotating electric machine comprising a plurality of single sheet cores, each single-sheet core being formed by arranging a plurality of salient poles continuously on a beltlike yoke plate and winding the beltlike yoke plate so as to be cylindrical while joining both ends of the beltlike yoke plate, wherein the laminated core is cylindrical and has a plurality of salient poles confronting a magnet, each salient pole having a winding and the laminated core is formed by laminating a plurality of the single-sheet cores.
Inventors
- 👤 Hirotaka Sakamaki
- 👤 Masayuki Ishikawa
- 👤 Hidetoshi Shimada
- 👤 Shizunori Mitsuma
- 👤 Hiroshi Zenisawa
- 👤 Kiyoshi Nagashima
- 👤 Noboru Takarasawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 23:28
CPC Classifications
H; H02; H02K; H02K1/00; H02K1/06; H02K1/12; H02K1/14; H02K1/146; H02K1/148
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
189 words
A laminated core for a rotating electric machine, comprising: a plurality of single sheet cores, each single-sheet core being formed by arranging a plurality of salient poles continuously on a belt-like yoke plate and winding the belt-like yoke plate so as to be cylindrical while joining both ends of the belt-like yoke plate, wherein the laminated core is cylindrical and has a plurality of salient poles confronting a magnet, each salient pole having a width and a winding, and the laminated core is formed by laminating a plurality of the single-sheet cores, wherein the yoke plate is made of a grain oriented silicon steel strip, and is formed so that the salient poles project in a direction of rolling a rolled grain oriented silicon steel strip, and wherein the yoke plate includes a plurality of slits, with a corresponding slit being disposed between adjacent salient poles, each slit having a depth defining an open end and a closed end such that a distance between the closed end and an opposite edge of the yoke plate is greater than or equal to 1/2 the width of a corresponding salient pole.
Claim 2
Dependent Claim
189 words
A laminated core for a rotating electric machine, comprising: a plurality of single sheet cores, each single-sheet core being formed by arranging a plurality of salient poles continuously on a belt-like yoke plate and winding the belt-like yoke plate so as to be cylindrical while joining both ends of the belt-like yoke plate, wherein the laminated core is cylindrical and has a plurality of salient poles confronting a magnet, each salient pole having a width and a winding, and the laminated core is formed by laminating a plurality of the single-sheet cores, wherein the yoke plate is made of a grain oriented silicon steel strip, and is formed so that the salient poles project in a direction of rolling a rolled grain oriented silicon steel strip, and wherein the yoke plate includes a plurality of slits, with a corresponding slit being disposed between adjacent salient poles, each slit having a depth defining an open end and a closed end such that a distance between the closed end and an opposite edge of the yoke plate is greater than or equal to 1/2 the width of a corresponding salient pole.
Claim 3
Dependent Claim
24 words
A laminated core for a rotating electric machine according to claim 1, wherein a plurality of single-sheet cores are formed by lamination press fitting.
Claim 4
Dependent Claim
58 words
A laminated core for a rotating electric machine according to claim 1, wherein the laminated core is formed by forming recessed portions on one surface of each single-sheet core and projected portions on an other surface thereof and by fitting the recessed portions and the projected portions formed on both surfaces with one another by lamination press fitting.
Claim 5
Dependent Claim
60 words
A laminated core for a rotating electric machine according to claim 1, wherein the laminated core is formed by staggering interfaces of the single-sheet cores, each single-sheet core being formed while joining both ends of the beltlike yoke plate having a plurality of salient poles continuously formed thereon and while winding such beltlike yoke plate so as to be cylindrical.
Claim 6
Dependent Claim
33 words
A laminated core for a rotating electric machine according to claim 1, wherein the yoke plate further includes V-shaped identations disposed on the opposite edge thereof so as to respectively confront the slits.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-10-09 | 1999-04-10 | 1999-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-10-09 | 2003-04-10 | 2003-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-10-09 | 2007-04-10 | 2007-10-10 | $7700.00 | Window Closed / Lapsed |